Sites with Direct Connections with Emperors: These sites, shown on the map in the purple colour, represent locations with well documented associations with specific emperors, usually in terms of the initiative for construction, actual residence or other use for significant periods of time.

Sites Connected with Military Campaigning by an Emperor: These sites, shown on the map in the light green colour, came into existence as a result of military campaigns conducted by various emperors for the occupation and consolidation of Roman control over the Danube provinces.

Sites Resulting from an Emperors’ Military Policy: These are military sites, shown on the map also in the light green colour, on the Danube frontier where garrisons were located which had responsibility for not only defence but also for control of river commerce, administration of the mining districts and maintenance of the Danube via militaris which connected the western and eastern parts of the Empire. The garrisons included both land-based troops and sailors of the Danube fleets.

Sites Resulting from an Emperors’ Political Policy: Various emperors instituted a deliberate policy to encourage the integration of conquered indigenous peoples into the government of the Roman Empire on the local level. This was accomplished through the granting of semi-autonomous self-rule to indigenous communities in Illyricum and the Danube provinces; this process is documented in the award of municipal status (Roman municipia, sometimes promoted to coloniae) as an upgrade to existing native settlements on conquered territory. Sometimes the establishment of the imperial cult of emperor worship to promote loyalty to the person of the emperor went along with the new municipal status. Included here also are what might be termed utilitarian sites with responsibilities for traffic control and road maintenance. These sites are shown on the map in red, dark blue and dark green colours.

Danube Wine Regions: In the lower Danube region viticulture can be traced back to pre-Roman times with the Greeks and Thracians. For the central Danube region wine came with the Roman army as an essential part of soldiers’ rations. At first Mediterranean wines were imported in the literally thousands of ceramic amphoras found on Roman military sites. Later local vineyards planted with military labour. The included wine regions are integrated with the Route sites along the Danube Corridor and in a general sense duplicate the vineyards introduced by the Roman army into the regions. For the indigenous peoples, who lived and worked alongside of the Roman soldiers, one can infer that a way “to act Roman” and in a certain sense “to be Roman” was to acquire a taste for this new beverage from the Mediterranean world. Wine regions are shown on the map in the light brown colour.